Codeforces 1109F. Sasha and Algorithm of Silence's Sounds
Description 給出一個 n ∗ m n*m n∗m 的網格圖，保證全部位置上的數造成一個 1 − n ∗ m 1 -n*m 1−n∗m 的排列。html 問有多少個值域區間 [ l , r ] [l,r] [l,r] 知足，在 [ l , r ] [l,r] [l,r] 中的數在網格圖上的位置造成一棵樹。node n ∗ m ≤ 200000 , n , m ≤ 1000 n*m\leq
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